It's often a judgement call, but a simple rule of thumb is to give 1 solid hint per net success:
Legwork on an extraction target, tiny dossier gives his name (Oliver Twist) and occupation (BioChemist at EVO)
1 net hit: Don't know him personally, but all EVO biochem stuff is done at EVO tower
2 net hits: Yeah, now that you mention it, he's on that team working on a new truth serum. Very hush-hush, though
3 net hits: I think those guys go out for brews and darts every Thursday night
4 net hits: You want to meet him? Head to McTavity's, the Irish pub on 4th.
5 net hits: I got a cousin works security at the EVO building. You want I should introduce you?
6 net hits: Oh, Oliver has a slight Meth habit. He's been in rehab about five times, so you want him to follow you anywhere, find a dealer first
etc etc