As a PR professional, a lot of my searches on various job boards have turned up titles like "Entry-level PR/Marketing/Communications Associate." In my last job search a couple years ago, I applied to a few of these and was immediately (ie, same day) contacted for interviews by all of them. They are all scam jobs that end up being either door to door sales, standing on the street and asking people for money, setting up booths about a product inside Costco, etc--in other words, nothing resembling PR or communications jobs whatsoever. Most of the job descriptions are intentionally vague but have all of the buzzwords, like "strong communications skills," etc., that people in the PR/comms industry tend to search for. Here's what I learned to look out for to avoid these types of scams, all of which pay mostly or entirely through commission. Please note that these aren't guarantees that the job you're applying for is a scam, just qualities that most or all of them seem to have in common:

1. IMMEDIATE HIRE and/or ENTRY LEVEL listed in the headline. Most jobs that are either or both of those that are legitimate jobs will tell you that after you apply, or they'll list it in a less spammy way further down in the posting.
2. A lot of these places will tell you you'll be in a management position within 6 months (sometimes in the actual job description). At some point they'll show you a chart that, for the most part, just rewards not quitting. Your "career path" is to go from asking people for money, to finding people to ask others for money, to interviewing/hiring those people.
3. They'll call you directly, often within a day (or even an hour) of you applying for the job. Almost all legitimate hirers (especially for jobs matching that title) will email you, and it's rarely that fast.
4. When they call you, they tell you it's a 15 minute in person interview and say they only offer in-person interviews. Also during that call, they'll ask you if you're ok starting at the entry level. These are flags because a 15 minute interview is rarely enough to get to know an interviewee; most businesses will at least consider phone/webcam interviews at least for the first round; and the entry level question is their way of cornering you and claiming that they did explain what the job is and what it pays before you come in (which they never do). The reason they do brief, in-person interviews is because they do interviews in large groups. You'll have a couple (and I mean 2 or 3) minutes of face time with an HR person who will ask you very basic questions about your background, and then they'll send you out "in the field" as part of an "extended interview," which is really just them trying to get you to give them a full day's work without them paying you. Then, if you make it past that stage, you'll meet the branch manager who'll tell you you have real potential, it's a rewarding job if you can push through the hard parts, etc.

The best way to sniff these out, other than looking for everything I listed above, is to ask the following question on your phone call, point-blank:

"Does this job involve door-to-door sales, standing outside or in retail establishments for all or most of the day, or in any other way directly asking people for money?" "Does this job have a salary, or at the very least a minimum guaranteed amount? Do you offer benefits?" "Is there any actual [insert job responsibility you want to have, such as writing, here] involved in the job? If so can you give examples of what I might be doing?" "What is the average day like for this position?"

The ones I've found so far are in DC (Blue Group, Vector Marketing) and Philadelphia (Phoenix Millennium Group, Arrowhead Marketing, Diamond Consulting Group, PeopleShare Inc, Limitless Strategies Inc, Advertising & Charity Events Marketing, the list goes on and on).

Unfortunately, most of these are jobs that have one-click apply available on various job boards, which means you'll probably click on them without thinking and then they have your contact information to blast you with phone calls for weeks. Just take the time to quickly read job listings for the above items (and even call the company to ask a few questions) before you submit an application.