rm useless sentence

Author: maelle

maintenance_marketing.Rmd

@@ -20,8 +20,6 @@ We will help you promoting your package but here are some more things to keep in
 
   - Make a pull request to [R Weekly](https://github.com/rweekly/rweekly.org) with a line about the release under the "New Releases" section (or "New Packages" for the first GitHub/CRAN release).
 
-  - Post about it on social media.
-  
   - Consider submitting a short post about the release to [rOpenSci tech notes](https://ropensci.org/technotes/). Contact rOpenSci Community Manager, (e.g. via Slack or [[email protected]](mailto:[email protected])). Refer to [the guidelines about contributing a blog post](https://blogguide.ropensci.org)).
 
   - Submit your package to lists of packages such as [CRAN Task Views](https://cran.r-project.org/web/views/).