Searching for your name on a search engine can quickly tell what others can collect about you. Try to search and find how much information is already online about you.
Use Google Alerts also to get auto updates about anything that might be added by you or your friends about you. You can report anything unpleasant to the hosting site or to an adult; if that image or content breaks the terms and policies of the hosting site, they will remove it once you report the issue.
Make the good stuff easy to be found
If you found that you do not like what is online about you, create new accounts at various social networks.
Think of what you can do to increase your positive presence?
Create posts with positive impressions you can also build your own blog and start sharing your constructive and positive ideas.