The Sims 4 City Living includes a Social Media Career, which lets you choose to become either a superstar Internet Personality or a Public Relations Representative. Both of these are solid careers with unique abilities, and certainly more interesting to take than the Politician due to the sheer number of interactions you can unlock. Because these careers require a social media presence, you can begin using the Social Networking feature on computers as soon as you join them, instead of needing Charisma Level 5.
WORK FROM HOME
This applies to both branches of this career, along with the other two included in the City Living Expansion Pack. Each day before work, you will see a popup in the lower left corner. Selecting this, you can choose to have your Sim work from home. You'll get a couple of tasks that must be completed in order to secure your pay and career performance. Aside from the tasks you're given, you have total control and can use the time to skill up or else work on career promotion requirements.
SOCIAL MEDIA CAREER LEVELS 1-3
The initial ideal mood is Playful. Since the skill requirements for these first 3 levels are not very difficult, consider which branch you will take so that you can begin to raise the skills you'll need. This will smooth out the promotion process and make it a little less likely you're stalled on one level for a long time.
INTERNET PERSONALITY BRANCH
The ideal mood for this branch is Playful. The most significant difficulty here is obtaining followers, but thankfully you are given many means to do so - knowing you need many more for each level should help. The Prank Streamers (under social networking) and Let's Play (under Play Games on Computer) contribute substantially more followers than other means of social networking - pranking in particular contributing hundreds of thousands when it goes well, though it does have a cooldown. You need to play games for a few hours in order to gain followers, it tells you how many you've gained when you stop playing. Note the jumps in skill level requirements from Video Gaming to Charisma, Comedy and Mischief. It is one of the harder careers to level for this reason, and provides less money per day in salary than certain other Careers. It makes up for this, big time, with the abilities you unlock as you level.
As in reality, you can sell out when you have a huge social media following, by advertising products. Doing so can net you well over 1k Simoleons (I got 1500) for the major product, and several hundred for a minor product. However, you lose followers when you do this. The Internet Personality gets a major edge over the PR Branch of this Career due to its ability to recover followers rapidly. The income generation helps this career to surpass others, and it is arguably one of the best-paying as you can earn money on demand, then recover followers.
PUBLIC RELATIONS BRANCH
The Ideal Mood for this branch of Social Media is Focused. Your new daily task, Network with Journalists, is found on the computer. Given the need to get up to 10,000 Followers on social media, you should be working on this even on levels where it is not required. Just a post here and there will do. The more followers you get, the more you'll gain as they help you to market your profile. When you are away from home, use the Shout Out/Status Update from Venue ability that is found on your phone under the home tab. It gives more followers than the usual computer interactions, but does feature a cooldown.