点击按钮自动加关注的代码(sina微博/QQ空间/人人网/腾讯微博)

sina微博：
<iframe width="120" height="24" frameborder="0" allowtransparency="true" marginwidth="0" marginheight="0" scrolling="no" border="0" src="http://widget.weibo.com/relationship/followbutton.php?language=zh_cn&width=120&height=24&uid=1756720421&style=2&btn=red&dpc=1"></iframe

QQ空间：
<iframe src="http://open.qzone.qq.com/like?url=http://user.qzone.qq.com/1839458293&type=button_num&width=120&height=24&style=3" allowtransparency="true" scrolling="no" border="0" frameborder="0" style="width:120px;height:24px;border:none;overflow:hidden;"></iframe>

人人网：
<iframe src="http://www.connect.renren.com/like?url=http://page.renren.com/699049347" style="width:140px;height:23px;" scrolling="no" frameborder="0" allowTransparency="true"></iframe>

腾讯微博：
<iframe id="previewmc" height="24" src="http://follow.v.t.qq.com/index.php?c=follow&a=quick&name=yanghaonan7758&style=5&t=1336022961842&f=0" frameborder="0" width="125" allowtransparency="true" scrolling="no"></iframe>