Besides call chains, another nice feature of Ribbit Mobile is that you can choose which number will appear on your contacts' phones when you call, even if you are calling from your computer.

手机版支持连锁呼叫（call chains）功能，并且你可以选择拨打电话时显示的号码。

youdao

"It will infect your computer and then choose a different name from your address book to send itself on to your contacts, " said Graham Cluley from anti-virus firm Sophos.

BBC: Bugbear virus threat increases

Select from this list the ones you want to network with and then choose who else in your contacts you would like to invite - though bear in mind they will get an e-mail from Twitter asking them to join up, so choose carefully the people you think will not mind this.

BBC: Wetpaintpleasetouch.com website