At least I think this is new. I noticed they have an agreement that you must agree to before publishing your post. It lists tons of different types of fees that users will be punished with by doing things like posting for the sole reason to collect respondents' information, running automated software/scripts to post their spam, and just spamming in general. I'll paste that part of the agreement below.
Thanks, Craigslist, for finally listening!
LIQUIDATED DAMAGES. You further agree that if you violatethe USE section, or you encourage, support, benefit from, or induceothers to do so, you will be jointly and severally liable to us forliquidated damages as follows for: (A) collecting/harvesting CL users'information, including personal or identifying information - $1 perviolation; (B) publishing/misusing personal or identifying informationof a third party in connection with your use of CL without that party'sexpress written consent - $1,000 per violation; (C) misrepresentingyour identity or affiliation to anyone in connection with your use ofCL - $1,000 per violation; (D) posting or attempting to post ProhibitedContent - $4 per violation; (E) posting or attempting to postProhibited Content in any paid section of CL - the price per postapplicable to that section of CL; (F) sending anunauthorized/unsolicited email to an email address obtained from CL -$25 per violation; (G) using CL user information to make/send anunauthorized/unsolicited text message, call, or communication to a CLuser - $500 per text/call/communication; (H) creating a misleading orunlawful CL account or buying/selling a CL account - $4 per violation;(I) abusing or attempting to abuse CL's flagging or reporting processes- $1 per violation; (J) distributing any software to facilitateviolations of the USE Section - $1,000 per violation; (K) aggregating,displaying, copying, duplicating, reproducing, distributing, orexploiting CL content for any purpose without our express writtenconsent - $3,000 for each day you engage in such violations; (L)requesting, viewing, or accessing more than 1,000 pages of CL in any24-hour period - $0.25 per page during the 24 hour period after thefirst 1,000 pages; (M) bypassing or attempting to bypass our moderationefforts - $4 per violation. You agree that these amounts are (1) areasonable estimate of our damages (as actual damages are oftendifficult to calculate), (2) not a penalty, and (3) not otherwiselimiting on our ability to recover under any legal theory or claim,including statutory damages and other equitable relief (e.g., for spam,we can elect between the above liquidated damages or statutory damagesunder the anti-spam statute). You further agree that repeatedviolations of the USE section will irreparably harm and entitle us toinjunctive or equitable relief, in addition to monetary damages.