Not such a good idea.
Recently, the Judicial Conference of the United States surveyed all 952 federal judges to see if jurors had used or misused scoail media during jury trials.
Most said they had not, or that if they did, it was to contact fellow jurors. Read more here.
Then again, maybe the Federal Courts have some catching up to do, since there is at least one documented case of a juror trying to “friend” a defendant during trial.