Answers:
Zwinky comes beside spyware. It comes next to mywebsearch which puts an unwanted toolbar into Internet Explorer. I've never hear of meez but from what I could see from some research it's probably safer.
if ur not sure dont
Its better to avoid them, since they are a part of the pack of smileycentral which is scandalous for spyware, which slows down ur PC.Yes be extraordinarily alert...There are better sites close to imvu.com for such stuff
do rate if it help