In general I would consider this a signature block, which is not necessarywhich is not necessary. I agree that removing the signature block is the correct thing to do here, since it's ultimately more words on the page that don't necessarily answer the question. Here at Stack Exchange we have an irrational love of signal-to-noise ratio. :)
The key point is that you're not promoting any specific technology, you are merely answering existing questions that are already about that technology.
Obviously mention your affiliation with Facebook in your user profile, of course, since that's relevant and interesting to anyone who wanted to know what your background is.
Oh, and thanks for participating -- and asking about this on meta!