-Medium- an agency or means of doing something.
-Technique-a skillful or efficient way of doing or achieving something.
-Proportion- a part, share, or number considered in comparative relation to a whole.
I don't believe dyslexia is a born disorder, and can be developed at any stage of life, given the circumstances leading to the development. It doesn't occur out of the blue, there is always a reason for the development of a learning disorder. I would not jump to the conclusion that you have dyslexia, though. It is simply a possibility. Other reasons your reading and writing could be affected includes lack of sleep, hormone rampages, environmental changes, etc. etc.
Since social media is a relatively new technology, there hasn't been much research done to determine if using it would have positive or negative long-term effects. But several studies have discovered a substantial correlation between using social media excessively and a higher risk of melancholy, anxiety, loneliness, self-harm, and even s*icide ideation. The majority of us now use our smartphones or tablets to access social media. While this makes staying in contact incredibly simple, it also makes social media always available. This continual, high-speed connectivity can lead to issues with impulse control, damage your ability to concentrate and focus, interfere with your sleep, and make you dependent on your phone.