Why get more visits in First case ?

Hey guys,

So i made a test new one

1- get more visits if new and stuffing keywords
2- less if i make a message in a newsgroup
3- waiting to see if i make a lot of external linking to other domain in a newsgroup message, do not know if it works really good (exemple your keyword linking to 1 external, other word to an other external)

I do not know the limit maybe 100 linking per message