Rapportive is handy for Gmail users because it shows you extra information about your contacts if you are using Gmail. When you open up your Gmail account, you can click on a contact and that person’s LinkedIn profile will appear on the right. It is handy if you deal with various businesspersons and freelancers who you do not know very well. It may also show you if they are telling you different things from what they are posting on their LinkedIn profile. Rapportive is an add-on for Firefox and Chrome. If you log into your Gmail account with Firefox or Chrome, then you may use this tool if the add-on is enabled.