as the title says, I need to automate posting ebay listings 2 twitter (with rover link) can it be done?

Not sure it can be done but it will get you banned quickly from ebay. You can only post the rover links on a site you own.

I wouldn't go the direct route with the rover, you would be better off building a blog with phpbay or WP Robot, then direct the twitter traffic by using the rss feed from your site, you'll need a bit.ly account and a twitterfeed.com account to do this automatically, and if you dig hard enough you'll find all the answers on automating twitter on here in the download section, its a tough game though not much action from twitter these days using ebay stuff,

If u want auto posting, twitterfeed.com is your best choose.