Advertising messages form an essential part of an effective online strategy for a website. They can generate revenue, increase conversions and grow mailing lists.\n\n\nThey have evolved from static banners restricted to sidebars to dynamically served content that can make or break a visitor's experience. From interstitial ads to pop-up messages to scroll boxes, ads are being used in an ever-greater capacity to drive results on websites.\n\n\nYet many businesses are using ads in ways that hinder, rather than help their success. Make sure you aren't alienating your visitors with any of the following three misuses of on-site ads.\n\n1. Disrupting the user experience\n\nBombarding your visitors with ads that constantly interrupt their interaction with your website is a surefire way to send them packing.\n\n\nIt's important to remember that ads are perceived to serve the needs of the website owner, rather than the visitor. In fact, visitors dislike on-site adverts so actively that over 198 million people now use ad blocking software when browsing the web.\n\n\nThink carefully about the most opportune times to present an ad to a visitor. Popular choices for first ads include on immediate arrival (before they have started reading) or after a few seconds (allowing them to get sufficiently interested in the content they were looking at to return to it after closing or acting on the ad).\n\n\nAvoid serving subsequent ads rapidly after the first ad has been closed, or running multiple campaigns that serve different ads simultaneously.\n\n2. Serving ads without personalization\n\nDelivering ads with content that is personalized to each visitor is the key to higher clicks. Studies show that relevance can help to combat banner blindness. This is becoming more and more important as internet users are bombarded with advertising messages at every turn. Irrelevant messages aren\u2019t just ineffective, they run the risk of conveying a message that you don\u2019t know (and therefor don\u2019t care about) your website visitors.\n\n\nUsing marketing automation software such as Marketo, Hubspot or SumoMe greatly simplifies the process of customizing when and how ads are served, and who they're aimed at. They allow you to design detailed campaigns that can target niche groups of visitors based on demographics and behavior. However, they come with a price tag which might put them out of reach of many businesses.\n\n\nNot having the power of an ad delivery tool is no excuse for lazy marketing strategy though. Your on-site ads can still benefit from more generalized personalization. At the very least, you should ensure that ads are relevant to the page where they are being served. You should also aim to serve different ads to existing customers and new visitors.\n\n\nConsider these typical mistakes in ad personalization:\n\n\nServing a \u201cSubscribe Now\u201d ad to someone who arrived at your site after clicking a link in the newsletter.\nDisplaying ads for new customer discounts to visitors who are already logged in to their accounts.\nPop-ups that promote your new products area to visitors who are already browsing that section of your site.\n\n3. Not customizing ads for mobile delivery\n\nMobile advertising is big business, with ad revenues expected to exceed $80 billion by 2018. Yet conversion rates for on-site ad campaigns from mobile devices are still much lower than desktop conversion rates. This is often due to poorly designed ad campaigns that fail due to some common reasons such as ad size, layout or placement.\n\n\nMobile users who can\u2019t see the whole ad or can't easily enter information miss out on your marketing message, and also have the frustration of needing to scroll around to try and view the whole ad. Rather than do this, they are more likely just to look for that \u201cX\u201d button to make it disappear. Which brings us to the next mobile ad fail: the inability of a visitor to get rid of it.\n\n\nOf course your ads are important to you. They are designed to help you build your mailing list, make sales and increase the average purchase value. But realistically, only a tiny fraction of visitors will engage with your ads. At the end of the day, people have visited your site for the content on the main page. Not allowing them to easily get rid of ads in order to view that content is a huge mistake. Not only is your ad not performing, but you are losing visitors.\n\n\nThink carefully about these three common pitfalls and see if you can make improvements to your on-site ads to enhance performance for visitors and ultimately improve your ROI.