topicmodels: Topic Models Provides an interface to the C code for Latent Dirichlet Allocation (LDA) models and Correlated Topics Models (CTM) by David M. Blei and co-authors and the C++ code for fitting LDA models using Gibbs ...

If it's something like topic extraction that you would like to do then perhaps something like this could be useful: cran.r-project.org/web/packages...
(I have not done LDA in R before so have not tried out this package)

While this might still some potential concerns, it also plays straight into one of the main purported problems with social media -- that teenagers use social media out of fomo. If platform presence is correlated with higher levels of offline interaction they might have good reason for this fear.