First of all, you should know that social signals broadly refer to all activities on social networks such as Facebook, Twitter, Instagram, etc. that also refer to your website. These can be, for example, likes, shares or comments on your posts. But also the number of your followers and friends on these platforms play a role. However, social signals can also come from other websites that have a high traffic and which the Googlebot trusts in terms of relevance by linking exactly these pages to your website - but more on that later...