How many press release should be done for same topic?

I am going to do a press release for the same thing and on the same day. The press releases won't be written the same exact way. Theirfore, should I do more then 1 press release using different sites, so their will be more exposure? And, is it necessary to do more then 1 press release, just in case one doesn't get as much as attention as the other one?

Note: If someone have been using the same method as this or is experienced in how to do press releases, please inform us what do you think of this!

 

Different sites, original press releases will give you more than one bite of the apple.

 

I think only one awesome written press release and only big PR distribution is enough for each topic. I would recommend to do press release for only story that worth. Overdoing it could make your PR less importants afterwards.