Recommend a Site Script?

Somebody asked me for a ‘Recommend this site to a friend’ script at the bottom of one of a site.

Can this be done without opening myself up to spammers? If so can anyone recommend a recommender?

Do take a look at’s tell-a-friend script. Though I haven’t used this particular script, I have used other scripts from
More about the script:
Demo of the script:
All the best -