Have the titans gotten less lazy? Last time I pointed them to very fishy people, they just shrugged and basically said "Meh, you didn't provide conclusive evidence" and closed the issue.
I've reported things to the Titans several times, and they have almost always pursued it within a few days, and generally have ended up locking (at least some of the) accounts I've reported. I generally present a several-thousand-word case outlining all available evidence with the report, though. Limit the amount of research they have to do, links to family accounts, important dates, etc.