How can I edit a comment I’ve already posted on Facebook Timeline?
This is a question that Facebook users have been asking for years and as of yesterday, commenting editing is now a feature of Facebook.
See Also: How to Hide Your Facebook Friends List on Timeline [Video]
If you post a comment on Facebook and want to edit or correct it, simply mouse over the comment and click on the pencil icon in the top right corner.
If you click on the “Edit…” option, your comment will be opened back up allowing you to edit, change and alter it in any way that you desire!

Bugs and notes on editing comments on Facebook:
For more Facebook Timeline information check out my Facebook Timeline Information and Tutorials Portal containing 25+ articles, tutorials and bug reports related to Facebook Timeline.
Anson Alexander is a graduate from the University of Tampa with a degree in International Business and Information Systems.A previous IT Administrator for a medium size publication company, Anson has recently decided to work full time on his own business by publishing on AnsonAlex.com, publishing technology tutorials on YouTube and offering SEO, IT training and digital marketing services.His main interests include technology, social media, infographics, economics, marketing and web design.Connect with Anson on Google+.
Ok.. But.. How to block or remove this "facebook camera", "facebook messenger iphone" and "facebook messenger android" apps from my apps? Any idea?