Common types include blog posts and guides, social posts, video, podcasts, email newsletters, research reports, case studies and webinars. For agencies, the format matters less than the point of view behind it. Tim Kilroy's approach favors content that shows understanding of a specific buyer's world, published by several team members rather than one founder.
The big five holding companies are traditionally listed as WPP, Omnicom, Publicis Groupe, Interpublic Group (IPG) and Dentsu. Omnicom announced a deal to acquire IPG in December 2024, so that list is consolidating. Most independent agencies compete in a very different market: Promethean Research reports that 87% of digital agencies employ fewer than 50 people.
There is no single official 3-3-3 rule in marketing. Different people use the phrase for different shorthand formulas, so ask whoever cites it what they mean. For agency growth, a more useful rule is Tim Kilroy's 20-second test: if people cannot describe what your agency does in under 20 seconds, your positioning is not working yet.
Most get them through referrals first. The RSW/US 2025 Agency Survey, as cited by Tim Kilroy, found 75% of agencies name referrals as their top new-business source. Agencies that grow past referrals add a clear position, consistent content from the team, direct conversations with a defined ideal client and a discovery process that turns interest into qualified deals.
The fastest route is usually the clients you already have. Tim Kilroy's account growth playbook cites Marketing Metrics research putting the probability of selling to an existing client at 60 to 70%, versus 5 to 20% for a brand-new prospect. For new logos, direct conversations with a tightly defined ideal client beat broad campaigns.
Nobody can say for certain, but the evidence so far points to change rather than replacement. Promethean Research's 2026 report found 33% of digital agencies have fully implemented AI and 48.5% are exploring it. Agencies that sell understanding of a client's business, not just production hours, are better placed as delivery gets faster.
AI implementation, growth pressure and fragmentation lead the list. Promethean Research reports 71,000 digital agencies in North America, up 42% since 2024, with 33% having fully implemented AI. SparkToro's 2025 State of Digital Agencies found only 14% of agencies describe their sales pipeline as very healthy, which is why demand systems matter.
No one can reliably predict which jobs AI will replace in five years, and published forecasts disagree. In agencies, repetitive production and reporting tasks are changing fastest, while judgment, strategy, client relationships and genuine point of view remain hard to automate. That is one reason DemandOS puts people with real expertise at the center of agency content.
Using AI to make ads is generally not illegal in itself. The usual advertising rules still apply: claims must be truthful, you need the rights to the material you use, and some platforms and jurisdictions have their own disclosure requirements. Check the rules where you run ads and confirm specifics with a qualified lawyer.
The best content ideas for marketing agencies come from questions your clients and prospects already ask. Turn recurring client problems into point-of-view posts, explain decisions your team makes, share what project managers see in delivery and interpret industry research for your niche. The content ideas page on this site lists ideas by team role.