From The TimeSplitters Wiki

Stickies are little boxes that can be put in your user page to provide information, they are very much like "UserBars" used in forum signatures. There are 2 types of stickies, Normal Stickies and Contact Stickies. Contact Stickies display information about how to contact the user, for more information & how to implement these into your page, see the Contact Stickies page.

Normal Stickies tell people about you, like which of the 3 games you have, if you like making maps, which console you own etc. To implement Normal Stickies into your user page, see this page.