I just heard of a 'service' called 'TwooglePlus', which will crosspost your tweets over to Google+.
DO NOT USE THIS : Since Google+ has no proper posting API, this service requires you to hand over your actual Google Account password.
I cannot stress what a BAD IDEA this is.
I know how these services are working, since I have seen the code behind all the hacks and scripts that are out there offering these post to Plus-type services.
Sadly, until Google opens up a proper posting API using the standard methods of application control (via OAuth2 etc.) we're going to see a lot more of these kinds of services appearing.
Many people will fall for this, since most people have no idea about security.
Hat tip to +Haja Rasolo for sharing the original site.
A quick search here for TwooglePlus shows that many people have already fallen for it. see : https://plus.google.com/u/0/s/TwooglePlus