Can you use internet marketing software legally? What the best Softwares available?

CAN YOU USE AUTOMATED SOFTWARE TO RUN ADS LETITALLY. EXAMPLES MYSPACE: BOTS. BOT TOWER, BADDER ADDER, FRIEND ADDER CRAIGSLIST POSTING BOTS WWW.THE-CLASSIFIED-CONNECTION.COM LIST TO 1500 CLASSIFIEDS AT ONCE. I ASSUME THE SOFTWARE IS LEGAL BECAUSE THEY ARE SELLING IT IN THE U.S. FROM US COMPANIES. ARE THE LEGAL? DO YOU KNOW ANY SOFTWARES THAT ARE [...]