Follow vs Colleague: Which is More Appropriate?

[Siana C.]

I tend to take things literal...Does "Colleague" imply some level of mutual familiarity? I am new to BP and have identified a few insightful members I'd welcome further communication with. Not sure whether to "Follow", or send a "Colleague" request. I did just send a colleague request, but afterward noticed the individual hasn't been active for months, thus prompting the question. Thanks in advance for your input.