I checked the last 50 entries in the block log. That takes us back to last July. Here are the usernames I could find that have userprofiles filled with spam links:
Jeffjohnson
Netak387
Dalles783
Giller599
Ferrey562
Inku452
Yiber
Friek387
Satjin342
These are spambots, not clueless users. Eight of the nine were created in two spammer runs on Jan 26 and Jan 27.