How can I know the number of people who have contacted me through Livebeep?

You can check the number of queries received in the system statistics. To do this go to Statistics > Conversion > Conversion of invitations. In the Filter tab (upper right) you can select the main variables: period, domain, operator, invitation, type of device.

In the same Statistics module you can check the conversion of other events (announcements, coupons), the most used keywords by your visitors to get to your website or the performance of the operators.