How to get backlinks for free?
Sometimes webmasters prefer to use tools to get external links for free. This can be done independently at the following sites:

social network,
sharing with a similar resource topic,
thematic catalogs and message boards.
If you act systemically, gradually increasing the link mass, no filters from search engines will suspect the process is unnatural. Today there are many services that help not only determine the number of external links, but also evaluate their quality. Using the exchange, it’s easy to build a link mass. It provides only high-quality thematic donors whose authority will help to successfully promote the resource.